A client sits before me, seeking help untangling his relationship problems. As a psychotherapist, I strive to be warm, nonjudgmental and encouraging. I am a bit unsettled, then, when in the midst of describing his painful experiences, he says, “I'm sorry for being so negative.”

A crucial goal of therapy is to learn to acknowledge and express a full range of emotions, and here was a client apologizing for doing just that. In my psychotherapy practice, many of my clients struggle with highly distressing emotions, such as extreme anger, or with suicidal thoughts. In recent years I have noticed an increase in the number of people who also feel guilty or ashamed about what they perceive to be negativity. Such reactions undoubtedly stem from our culture's overriding bias toward positive thinking. Although positive emotions are worth cultivating, problems arise when people start believing they must be upbeat all the time.

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In fact, anger and sadness are an important part of life, and new research shows that experiencing and accepting such emotions are vital to our mental health. Attempting to suppress thoughts can backfire and even diminish our sense of contentment. “Acknowledging the complexity of life may be an especially fruitful path to psychological well-being,” says psychologist Jonathan M. Adler of the Franklin W. Olin College of Engineering.

Meaningful MiseryPositive thoughts and emotions can, of course, benefit mental health. Hedonic theories define well-being as the presence of positive emotion, the relative absence of negative emotion and a sense of life satisfaction. Taken to an extreme, however, that definition is not congruent with the messiness of real life. In addition, people's outlook can become so rosy that they ignore dangers or become complacent [see “Can Positive Thinking Be Negative?”].

Eudaemonic approaches, on the other hand, emphasize a sense of meaning, personal growth and understanding of the self—goals that require confronting life's adversities. Unpleasant feelings are just as crucial as the enjoyable ones in helping you make sense of life's ups and downs. “Remember, one of the primary reasons we have emotions in the first place is to help us evaluate our experiences,” Adler says.

Adler and Hal E. Hershfield, a professor of marketing at New York University, investigated the link between mixed emotional experience and psychological welfare in a group of people undergoing 12 sessions of psychotherapy. Before each session, participants completed a questionnaire that assessed their psychological well-being. They also wrote narratives describing their life events and their time in therapy, which were coded for emotional content. As Adler and Hershfield reported in 2012, feeling cheerful and dejected at the same time—for example, “I feel sad at times because of everything I've been through, but I'm also happy and hopeful because I'm working through my issues”—preceded improvements in well-being over the next week or two for subjects, even if the mixed feelings were unpleasant at the time. “Taking the good and the bad together may detoxify the bad experiences, allowing you to make meaning out of them in a way that supports psychological well-being,” the researchers found.

Negative emotions also most likely aid in our survival. Bad feelings can be vital clues that a health issue, relationship or other important matter needs attention, Adler points out. The survival value of negative thoughts and emotions may help explain why suppressing them is so fruitless. In a 2009 study psychologist David J. Kavanagh of Queensland University of Technology in Australia and his colleagues asked people in treatment for alcohol abuse and addiction to complete a questionnaire that assessed their drinking-related urges and cravings, as well as any attempts to suppress thoughts related to booze over the previous 24 hours. They found that those who often fought against intrusive alcohol-related thoughts actually harbored more of them. Similar findings from a 2010 study suggested that pushing back negative emotions could spawn more emotional overeating than simply recognizing that you were, say, upset, agitated or blue.

Even if you successfully avoid contemplating a topic, your subconscious may still dwell on it. In a 2011 study psychologist Richard A. Bryant and his colleagues at the University of New South Wales in Sydney told some participants, but not others, to suppress an unwanted thought prior to sleep. Those who tried to muffle the thought reported dreaming about it more, a phenomenon called dream rebound.

Suppressing thoughts and feelings can even be harmful. In a 2012 study psychotherapist Eric L. Garland of Florida State University and his associates measured a stress response based on heart rate in 58 adults in treatment for alcohol dependence while exposing them to alcohol-related cues. Subjects also completed a measure of their tendency to suppress thoughts. The researchers found that those who restrained their thinking more often had stronger stress responses to the cues than did those who suppressed their thoughts less frequently.

Accepting the PainInstead of backing away from negative emotions, accept them. Acknowledge how you are feeling without rushing to change your emotional state. Many people find it helpful to breathe slowly and deeply while learning to tolerate strong feelings (see "Breathing Techniques for Less Stress & More Energy") or to imagine the feelings as floating clouds, as a reminder that they will pass. I often tell my clients that a thought is just a thought and a feeling just a feeling, nothing more.

If the emotion is overwhelming, you may want to express how you feel in a journal or to another person. The exercise may shift your perspective and bring a sense of closure. If the discomfort lingers, consider taking action. You may want to tell a friend her comment was hurtful or take steps to leave the job that makes you miserable.

You may also try doing mindfulness exercises to help you become aware of your present experience without passing judgment on it. (See "How to Live in the Now" for a mindfulness primer to get you started.) One way to train yourself to adopt this state is to focus on your breathing while meditating and simply acknowledge any fleeting thoughts or feelings. This practice may make it easier to accept unpleasant thoughts.

Earlier this year Garland and his colleagues found that among 125 individuals with a history of trauma who were also in treatment for substance dependence, those who were naturally more mindful both coped better with their trauma and craved their drug less. Likewise, in a 2012 study psychologist Shannon Sauer-Zavala of Boston University and her co-workers found that a therapy that included mindfulness training helped individuals overcome anxiety disorders. It worked not by minimizing the number of negative feelings but by training patients to accept those feelings.

“It is impossible to avoid negative emotions altogether because to live is to experience setbacks and conflicts,” Sauer-Zavala says. Learning how to cope with those emotions is the key, she adds. Indeed, once my client accepted his thoughts and feelings, shaking off his shame and guilt, he saw his problems with greater clarity and proceeded down the path to recovery.

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This article by Tori Rodriguez originally appeared in Scientific American Mind magazine. Tori is an Atlanta-based writer, psychotherapist, and mind-body health & fitness expert. She is the owner of Bettie Page Fitness, author of The Little Book of Bettie, and editor of the official Bettie Page social media pages and blog.